A new eddy current electromagnetic damper

Abstract

The application relates to the technical field of electromagnetic damping, and provides a novel eddy current electromagnetic damper which comprises a cylindrical shell conductor plate (formed by embedding a conductive plate and a magnetic conductive plate), a ring-shaped Halbach permanent magnet array (as a mover), two strip-shaped permanent magnets, a central shaft and an end cover. When the damper is impacted, the mover and the stator move relatively, the conductive plate generates an eddy current, and an eddy current resistance is formed. Meanwhile, repulsion between N poles between the two strip-shaped permanent magnets and the ring-shaped Halbach permanent magnet array generates repulsion force, pushes the ring-shaped Halbach permanent magnet array back to the middle position, and makes the damper reset rapidly. The damper has the advantages of simple structure, low cost and high reliability, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic damping technology, specifically a novel eddy current electromagnetic damper capable of generating a damping effect through the interaction between eddy currents and permanent magnets. Background Technology

[0002] In the field of electromagnetic damping technology, traditional damper designs often rely on mechanical friction or electromagnetic induction principles to dissipate energy, thereby mitigating motion or impact. However, these traditional designs have many shortcomings. Mechanical friction dampers gradually reduce their damping effect after prolonged use due to wear and changes in friction, and they also have high maintenance costs. While electromagnetic induction dampers offer advantages such as fast response speed and high control precision, their complex structure, high manufacturing cost, and potential performance degradation under extreme environments are significant drawbacks.

[0003] In recent years, with the continuous development of materials science and electromagnetic theory, people have begun to explore new types of electromagnetic dampers that utilize the interaction between eddy currents and permanent magnets. These dampers use the eddy currents generated when a conductor moves in a magnetic field to dissipate energy, thereby achieving a damping effect. However, some designs have failed to fully utilize the interaction between eddy currents and permanent magnets, resulting in limited damping effects, excessive complexity, and high manufacturing costs, hindering large-scale application. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a novel eddy current electromagnetic damper. It aims to achieve a stronger damping effect by optimizing the interaction between eddy currents and permanent magnets, while also enabling rapid reset after impact, thus ensuring the stability and reliability of the equipment. This damper boasts advantages such as simple structure, low cost, and ease of manufacturing and maintenance, making it suitable for large-scale application.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A novel eddy current electromagnetic damper includes: a cylindrical outer conductor plate as a stator, the conductor plate being composed of a conductive plate and a magnetic plate; a ring-shaped Halbach permanent magnet array as a mover, placed inside the conductor plate, with its inner side being the S pole and its outer side being the N pole; two strip permanent magnets fixed on both sides inside the conductor plate, with their sides near the ring-shaped permanent magnets being the N pole; and a central shaft with a smooth surface, on which the ring-shaped Halbach permanent magnet array is nested.

[0006] When one side of the eddy current electromagnetic damper is impacted, the relative motion between the mover and stator generates eddy currents in the conductive plate, which cut magnetic field lines, thus producing eddy current drag. Furthermore, after the impact, the annular Halbach permanent magnet array may deviate from its initial center position. At this time, due to the principle of repulsion between the N poles of the two bar permanent magnets and the annular permanent magnet, a repulsive force pointing towards the center position is generated. This repulsive force pushes the annular Halbach permanent magnet array back to the center position, allowing the damper to quickly return to its initial state so that it can function normally upon the next impact.

[0007] Based on the above technical principles, the outer shell conductor plate is cylindrical and is composed of a conductive plate and a magnetic plate nested together. The outer shell conductor plate and the end cap together form a stable structure.

[0008] Based on the above technical principles, the central shaft is inserted inside the outer shell conductor plate and fixed with bearings and screws, assembling components such as the annular Halbach permanent magnet array, conductor plate, and bar permanent magnet together.

[0009] Based on the above technical principles, the ring-shaped Halbach permanent magnet array is arranged according to the Halbach array method so that the inner side is the S pole and the outer side is the N pole.

[0010] Based on the above technical principle, the annular Halbach permanent magnet array is connected inside the conductor plate by a central axis. The surface of the central axis is smooth, and the inner diameter of the annular Halbach permanent magnet array is slightly larger than the diameter of the central axis, so that the annular Halbach permanent magnet array can move freely relative to the central axis.

[0011] Based on the above technical principle, the strip permanent magnet is fixed to both sides inside the conductor plate with screws, with the N pole facing the ring-shaped Halbach permanent magnet array.

[0012] Based on the above technical principles, the end cap is nested on the outside of the central shaft and fixed to the outside of the conductor plate with screws to ensure the airtightness of the conductor. The central shaft is fixed in a certain position by a suitable screw snap connection with the cylindrical outer shell conductor plate.

[0013] Based on the above technical principles, the annular Halbach permanent magnet array is made of permanent magnet material, the conductor plate is made of conductive and magnetic material, and the central shaft is made of aluminum.

[0014] The present invention has a clear structural design, is economical, practical and reliable, has a simple structure, low cost, high damping efficiency and wide applicability, and is suitable for large-scale promotion and application. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the front structure of the novel eddy current electromagnetic damper of the present invention; Figure 2 This is a side cross-sectional view of the novel eddy current electromagnetic damper of the present invention. Figure 3 This is a schematic diagram of the front cross-sectional structure of the novel eddy current electromagnetic damper of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the outer shell conductor plate of the novel eddy current electromagnetic damper of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the annular Halbach permanent magnet array of the novel eddy current electromagnetic damper of this invention.

[0017] The attached figures are labeled as follows: 1. Conductive plate and magnetic plate; 2. Ring-shaped Halbach permanent magnet array; 3. End cap; 4. Bearing; 5. Bar permanent magnet; 6. Central shaft; 7. Conductor plate shell; 8. Screw. Detailed Implementation

[0018] To make the objectives, techniques, implementation methods, and expected results of this application clearer, the following detailed description, in conjunction with the accompanying drawings, further illustrates this application. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] A novel eddy current electromagnetic damper includes: Cylindrical outer shell conductor plate 7: The outer shell conductor plate 7 is composed of a conductive plate 1 and a magnetic plate 1 nested together. The outer shell conductor plate 7 and the end cap 3 together form a stable structure. Annular Halbach permanent magnet array 2: Inside the outer shell conductor plate 7, nested on the central shaft 6, arranged according to the Halbach array method so that its inner surface is the S pole and its outer surface is the N pole. The surface of the central shaft 6 is smooth. The inner diameter of the annular Halbach permanent magnet array 2 is slightly larger than the diameter of the central shaft 6, so that the annular Halbach permanent magnet array 2 can move freely relative to the central shaft 6. Two strip permanent magnets 5: The strip permanent magnets 5 are fixed to both sides inside the outer shell conductor plate 7 by screws 8, and their side near the annular Halbach permanent magnet array 2 is the N pole; Central shaft 6: The surface of the central shaft 6 is smooth. It is inserted into the outer shell conductor plate 7 and fixed by bearing 4 and screw 8. The annular Halbach permanent magnet array 2 is nested on it. End cap 3: The end cap 3 is nested on the outside of the central shaft 6 and fixed to the outside of the outer shell conductor plate 7 with screws 8 to ensure its internal airtightness. It is connected to the cylindrical outer shell conductor plate 7 by a suitable screw 8 bayonet connection method to fix the central shaft 6 in a certain position.

[0020] The Halbach permanent magnet array 2 utilized in this invention is an approximately ideal structure. Through a special arrangement using the Halbach array method, it can generate the strongest magnetic field with a minimal amount of magnets. When the eddy current electromagnetic damper is impacted, the end cap 3 is impacted first, causing the annular Halbach permanent magnet array 2 to move along the smooth central axis 6. Simultaneously, the outer shell conductor plate 7 remains stationary relative to the annular Halbach permanent magnet array 2, resulting in relative motion. At this time, the special magnetic field distribution of the annular Halbach permanent magnet array 2 interacts with the outer shell conductor plate 7, thereby inducing eddy currents in the conductive plates 1 within the outer shell conductor plate 7. Subsequently, these eddy currents begin to cut magnetic field lines, generating eddy current resistance, which hinders the impact. After an impact, the annular Halbach permanent magnet array 2 inside the outer conductor plate 7 will deviate from its initial position. Due to the principle of repulsion between the N poles of the two bar permanent magnets 5 and the annular Halbach permanent magnet array 2, a repulsive force pointing towards the center will be generated. This repulsive force will push the annular Halbach permanent magnet array 2 back to its initial position, allowing the eddy current damper to quickly return to its initial state so that it can function normally under the next impact. Finally, due to the connection between the end cap 3 and the outer conductor plate 7, the end cap 3 protects the internal components of the damper and provides structural stability for the entire damper, preventing displacement or loosening of internal components under impact. This ensures that the eddy current damper continues to function effectively in impact-resistant applications, and is economical, practical, reliable, simple in structure, and low in cost.

[0021] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A novel eddy current electromagnetic damper, characterized in that... include: Cylindrical outer conductor plate: As a stator, the outer conductor plate is composed of nested conductive plates and magnetic plates; Ring-shaped Halbach permanent magnet array: as a mover, it is nested on the central axis inside the outer shell conductor plate and arranged according to the Halbach array method so that its inner side is the S pole and its outer side is the N pole; Two bar-shaped permanent magnets: fixed to both sides inside the outer shell conductor plate by screws, with the side closest to the ring-shaped Halbach permanent magnet array being the N pole; Central shaft: with a smooth surface, the central shaft is inserted inside the outer conductor plate and fixed by bearings and screws, and a ring-shaped Halbach permanent magnet array is nested on it; End cap: nested on the central shaft and secured to the outer side of the conductor plate with screws.

2. When one side of the eddy current electromagnetic damper is impacted, the relative motion between the mover and stator generates eddy currents in the conductive plate, which cut magnetic field lines, thus producing eddy current drag. Furthermore, after the impact, the annular Halbach permanent magnet array may deviate from its initial center position. At this time, due to the principle of repulsion between the N poles of the two bar permanent magnets and the annular permanent magnet, a repulsive force pointing towards the center position is generated. This repulsive force pushes the annular Halbach permanent magnet array back to the center position, allowing the damper to quickly return to its initial state so that it can function normally upon the next impact.

3. The novel eddy current electromagnetic damper as described in claim 1, characterized in that, The conductor plate is cylindrical and consists of a nested conductive plate and a magnetic plate. The conductive plate and the magnetic plate are made of high conductivity material and high magnetic permeability material, respectively, to improve the generation efficiency of eddy currents and enhance the magnetic field effect.

4. The novel eddy current electromagnetic damper as described in claim 1, characterized in that, The central shaft is inserted inside the conductor plate and fixed with bearings and screws, assembling components such as the annular Halbach permanent magnet array, the conductor plate, and the bar permanent magnet together, serving as a track connecting the annular Halbach permanent magnet array and its movement.

5. The novel eddy current electromagnetic damper as described in claim 1, characterized in that, The annular Halbach permanent magnet array is connected inside the conductor plate via a central axis. The annular Halbach permanent magnet array is made of permanent magnet material, the conductor plate is made of conductive and magnetic material, and the central axis is made of aluminum.

6. The novel eddy current electromagnetic damper as described in claim 1, characterized in that, The ring-shaped Halbach permanent magnet array is arranged according to the Halbach array method so that the inner side is the S pole and the outer side is the N pole, ensuring that it repels the N pole of the bar magnet.

7. The novel eddy current electromagnetic damper as described in claim 1, characterized in that, The bar-shaped permanent magnet is fixed to both sides inside the conductor plate with screws, with the N pole facing the ring-shaped Halbach permanent magnet array to ensure that the repulsive force with the N pole of the ring-shaped Halbach permanent magnet array is large enough.

8. The novel eddy current electromagnetic damper as described in claim 1, wherein the end cap is nested on the outside of the central shaft and fixed to the outside of the conductor plate with screws to ensure the airtightness of the conductor.

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